The following data are collected for a neonate receiving mec…

The following data are collected for a neonate receiving mechanical ventilation with a pressure ventilator: IMV mode | vent rate 40/min | inspiratory pressure 28 cmH2O | FiO2 0.70 | PEEP 4 cmH2O pH 7.41 | PaCO2 43 torr | PaO2 41 torr | HCO3 23 mEq/L | BE 0 On the basis of these data, the RT should recommend which of the following?